Variations in City Exposure and Sensitivity to Tsunami ...

Variations in City Exposure and Sensitivity to Tsunami Hazards in Oregon

Scientific Investigations Report 2007-5283

U.S. Department of the Interior U.S. Geological Survey

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Variations in City Exposure and Sensitivity to Tsunami Hazards in Oregon

By Nathan Wood

Scientific Investigations Report 2007-5283

U.S. Department of the Interior U.S. Geological Survey

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U.S. Department of the Interior DIRK KEMPTHORNE, Secretary U.S. Geological Survey Mark D. Myers, Director

U.S. Geological Survey, Reston, Virginia: 2007

This report and any updates to it are available at:

For product and ordering information: World Wide Web: Telephone: 1-888-ASK-USGS For more information on the USGS--the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: Telephone: 1-888-ASK-USGS

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report.

Suggested citation: Wood, Nathan, 2007, Variations in city exposure and sensitivity to tsunami hazards in Oregon: U.S. Geological Survey Scientific Investigations Report 2007-5283, 37 p. Cataloging-in-publication data are on file with the Library of Congress ().

Produced in the Western Region, Menlo Park, California Manuscript approved for publication, December 12, 2007 Text edited by James W. Hendley II Layout by David R. Jones

FRONT COVER--The cities of Manzanita (left) and Seaside (right) on the Oregon coast, shown with the internationally adopted tsunami-evacuation sign (Intergovernmental Oceanographic Commission, 2003). (USGS photographs by Nathan Wood.)

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Contents

Abstract............................................................................................................................................................1 Introduction.....................................................................................................................................................1

Purpose and Scope...............................................................................................................................3 Study Area ......................................................................................................................................................4 Methods and Data..........................................................................................................................................5

Land Data................................................................................................................................................5 Population Data.....................................................................................................................................5 Economic Data.......................................................................................................................................7 Critical-Facilities Data .........................................................................................................................7 Composite Indices of Exposure and Sensitivity...............................................................................8 Statistical Methods...............................................................................................................................8 Results...............................................................................................................................................................8 Land Cover..............................................................................................................................................8 Land Use.................................................................................................................................................9 Population.............................................................................................................................................11

Residents.....................................................................................................................................11 Employees....................................................................................................................................15 Dependents.................................................................................................................................16 Public Venues.............................................................................................................................18 Economic Assets.................................................................................................................................20 Critical and Essential Facilities.........................................................................................................24 Composite Indices of Exposure and Sensitivity.............................................................................25 Statistical Relationship to Land Cover.............................................................................................27 Summary........................................................................................................................................................28 Acknowledgments........................................................................................................................................29 References Cited..........................................................................................................................................29 Glossary.........................................................................................................................................................33 Appendix A. North American Industry Classification System .............................................................34 Appendix B. Overview of Project Database ..........................................................................................37

Figures

1. Map of the Cascadia Subduction Zone................................................................................................2 2. Photographs of (A) the City of Manzanita, (B) the Port of Garibaldi,

(C) the Port of Astoria, and (D) the City of Seaside...........................................................................3 3. Conceptual diagram of societal risk to disasters................................................................................3 4. Map of counties and communities on the Oregon coast with land

in the tsunami-inundation zone.............................................................................................................4 5. Maps of 2001 NOAA C-CAP land-cover data for the (A) City of Lakeside,

(B) City of Newport, and (C) City of Seaside, Oregon........................................................................6 6. Conceptual diagram of populations at risk from natural hazards....................................................7 7. Distribution of land-cover classes (by area) in the tsunami-inundation zone for

(A) the entire Oregon coast, and (B) the 26 incorporated cities......................................................9

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